North Korea is set to accelerate its nuclear missiles programme as Pyongyang ratchets up its war warnings to the US.

The North Korean regime said today that it has nothing to fear from the US move to broaden sanctions aimed at cutting it off from the global financial system and will pursue "acceleration" of its nukes development.

This includes developing a "pre-emptive first strike capability" and an inter-continental ballistic missile (ICBM), said Choe Myong Nam, deputy North Korean ambassador at the UN.

It comes after the North Koreans issued a propaganda video appearing to depict a military strike on a US Navy aircraft carrier.

The footage contains explosive sound effects, rendered flames and a selection of military images set to music with a female narrator over the top.

The video published to YouTube by Pyongyang's official Uriminzokkiri website uses pictures of the US and South Korea's yearly 'Foal Eagle' military drills which started this month, Newsweek reports.

The government-owned media of Pyongyang has previously threatened to act if North Korea felt its sovereignty had been compromised by the rehearsal operations miles from North Korean territory.